ArgumentException Class


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The exception that is thrown when one of the arguments provided to a method is not valid.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

Public Class ArgumentException
	Inherits SystemException
	Implements ISerializable


Initializes a new instance of the ArgumentException class.

System_CAPS_protmethodArgumentException(SerializationInfo, StreamingContext)

Initializes a new instance of the ArgumentException class with serialized data.


Initializes a new instance of the ArgumentException class with a specified error message.

System_CAPS_pubmethodArgumentException(String, Exception)

Initializes a new instance of the ArgumentException class with a specified error message and a reference to the inner exception that is the cause of this exception.

System_CAPS_pubmethodArgumentException(String, String)

Initializes a new instance of the ArgumentException class with a specified error message and the name of the parameter that causes this exception.

System_CAPS_pubmethodArgumentException(String, String, Exception)

Initializes a new instance of the ArgumentException class with a specified error message, the parameter name, and a reference to the inner exception that is the cause of this exception.


Gets a collection of key/value pairs that provide additional user-defined information about the exception.(Inherited from Exception.)


Gets or sets a link to the help file associated with this exception.(Inherited from Exception.)


Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.(Inherited from Exception.)


Gets the Exception instance that caused the current exception.(Inherited from Exception.)


Gets the error message and the parameter name, or only the error message if no parameter name is set.(Overrides Exception.Message.)


Gets the name of the parameter that causes this exception.


Gets or sets the name of the application or the object that causes the error.(Inherited from Exception.)


Gets a string representation of the immediate frames on the call stack.(Inherited from Exception.)


Gets the method that throws the current exception.(Inherited from Exception.)


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.(Inherited from Exception.)


Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetObjectData(SerializationInfo, StreamingContext)

Sets the SerializationInfo object with the parameter name and additional exception information.(Overrides Exception.GetObjectData(SerializationInfo, StreamingContext).)


Gets the runtime type of the current instance.(Inherited from Exception.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Creates and returns a string representation of the current exception.(Inherited from Exception.)


Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.(Inherited from Exception.)

ArgumentException is thrown when a method is invoked and at least one of the passed arguments does not meet the parameter specification of the called method. The ParamName property identifies the invalid argument.

Most commonly, an ArgumentException is thrown by the common language runtime or another class library and indicates developer error. If you throw an ArgumentException from your code, you should ensure that the exception's Message property includes a meaningful error message that describes the invalid argument and the expected range of values for the argument.

The primary derived classes of ArgumentException are ArgumentNullException and ArgumentOutOfRangeException. These derived classes should be used instead of ArgumentException, except in situations where neither of the derived classes is acceptable. For example, exceptions should be thrown by:

  • ArgumentNullException whenever null is passed to a method that does not accept it as a valid argument.

  • ArgumentOutOfRangeException when the value of an argument is outside the range of acceptable values; for example, when the value "46" is passed as the month argument during the creation of a DateTime.

If the method call does not have any argument or if the failure does not involve the arguments themselves, then InvalidOperationException should be used.

ArgumentException uses the HRESULT COR_E_ARGUMENT, which has the value 0x80070057.

For a list of initial property values for an instance of ArgumentException, see the ArgumentException constructors.

The following example demonstrates how to throw and catch an ArgumentException. It uses the ArgumentException.GetType().Name property to display the name of the exception object, and also uses the Message property to display the text of the exception message.

Public Class Example
    Public Shared Sub Main()
        ' Define some integers for a division operation.
        Dim values() As Integer = { 10, 7 }

        For Each value In values
               Console.WriteLine("{0} divided by 2 is {1}", value, DivideByTwo(value))
            Catch e As ArgumentException
               Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message)
            End Try
    End Sub

    Private Shared Function DivideByTwo(ByVal num As Integer) As Integer
        ' If num is an odd number, throw an ArgumentException.
        If (num And 1) = 1 Then
            Throw New ArgumentException(String.Format("{0} is not an even number", num), 
        End If
        Return num \ 2
    End Function
End Class
' The example displays the following output:
'     10 divided by 2 is 5
'     ArgumentException: 7 is not an even number
'     Parameter name: num

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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